MCAC-CTSM-2014-03 DX type water-cooled screw chiller (PCB Control)
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Ⅵ. Commissioning
1.Pre start-up
(1) Electrical System Inspection
1) Inspect whether power distribution capacity is compliant with the power of the unit before the first
start-up, and whether the diameter of the selected cable can bear the maximum working current of
the master compressor.
The max economical conveying distance:
2) Inspect whether the electric mode is compliant with that of the unit, three-phase five-line (three
phase lines, one zero line and one earth wire, 380V±10%).
3) Inspect whether the maximum phase voltage unbalance is compliant with the requirement, 2%
for the maximum permissible phase voltage unbalance and 5% for the phase current balance.
The machine must not be started up when the phase voltage unbalance exceeds 2%. If the
measured unbalance% is excess, the power supply sector shall be informed of immediately.
4) Inspect whether the supply circuit is the compressor is firmly and properly connected, and
tighten it if there is any looseness. The screws might be loose due to the factors such as
long-distance transport and hoisting of the master compressor. Or, the electrical elements (e.g.
air switch, AC contactor, etc.) in the control cabinet of the master compressor and the
compressor might be damaged.
5) Carefully inspect all the electrical lines with a multi-meter, and whether the connections are
properly installed. Carry out measurement in mega ohm and ensure that there is no short circuit
at the shell. Inspect whether the earth wire is properly installed, and whether the insulation
resistance to ground exceeds 2MΩ. And inspect whether the supply line meets the requirement
of capacity.
6) Inspect whether disconnection switch is installed to the supply line of the supply unit.
7) Carry out complete inspect for all connections of the main circuit in the control cabinet and all
external connections of the control circuit before power connection (e.g. oil heater, compressor
electronic protection, circulatory water temperature sensor, target-type flow switch connection,
water pump linked control, communication line connection, etc.); inspect the bolts of the wiring
terminal for looseness. Inspect whether various electric meters and appliances are properly
installed, complete and available. Inspect the interior and exterior of the electrical cabinet,
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